either way, it's more the physics involved that make it impossible...such an incline would create insane speed, and the friction would melt those skates instantly
that rail is impossible, its way to steep and way to big, you'd eat shit everytime you landed just because of the force. The rail video posted above is pussy shit compared to the picture, the original has twice the incline as that one, and its kinked, which would slow you down more. Not to say that rail isn't burly, but its actually possible